Apply lazy_required when inheriting from existing attributes #1
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This is a bug that was reported 8 years ago, and has been bugging me on-and-off for a while.
Basically, because _process_options isn't called if you're inheriting from another class, lazy_required wasn't getting applied in a sub-class. There was an initial test class supplied in the bug report that I've used as a base; I've updated some of the wording to (in my mind) make it clearer what we're trying to test.